3-dicarbonyls 2 using ammonium acetate as a nitrogen source. The axial chirality of bipyrrole was anticipated from the X-ray crystal structure and DFT calculations and confirmed by separating the racemates on a chiral column and subsequent CD spectra of the enantiomers. The absolute configuration of the enantiomers was achieved by theoretical CD spectra calculation using the ZINDO method.
3,3'-联
吡咯3可以使用双迈克尔加成反应合成,该反应涉及使用
乙酸铵作为氮源的二芳酰基
乙炔1和适当的1,3-二羰基2。通过X射线晶体结构和DFT计算可以预测联
吡咯的轴向手性,并通过分离手性柱上的外消旋物和随后的对映体CD光谱来确认。对映异构体的绝对构型是使用ZINDO方法通过理论CD光谱计算获得的。